T-Mobile announced today some interesting updates to Bobsled. In collaboration with Vivox, Bobsled is T-Mobile's bid at providing "a universal way to communicate however and whenever when connected to the Web."

First in the lineup of T-Mobile's improvements to its Bobsled service is the ability to call, message, and voice message their Facebook contacts at any time. To implement this service, T-Mobile offers the ability to turn on a sort of Bobsled toolbar (in the form of a Facebook app) - a tab that displays in your browser (meaning you see it almost all the time) and slides along web pages, allowing for quick access to calling options.

Bobsled also offers free calling to mobile and landline numbers in the U.S., Canada, and Puerto Rico.

Finally, Bobsled has a mobile app for both Android and iOS, allowing users to make free calls from their mobile device.

These improvements will be particularly handy for travelers, as users can call for free from inside or outside the U.S. The only catch is that it seems users cannot add phone numbers to Facebook contacts from the mobile app, so if your contacts don't list their numbers online, you may not be able to call them.

If you're tired of buying Skype credits to make web calls from your mobile device, and don't mind possible limitations as to whom you can call, head to the market and grab the app, or check out Bobsled.com for more info!